PHP support

[Gie Katon]

I have just finished rewriting Multiavatar in PHP.

It is now being used for the https://api.multiavatar.com, which became much faster, because before it was a mix of PHP and Node.js, and now just PHP.

Further on, I'm planning to build avatar images "on the fly". On user request, the image will be generated and saved on the server. It will be possible to generate and access it directly just by adding .png or .svg at the end of the URL, e.g. https://multiavatar.com/Starcrasher.png

Additionally, this PHP script will be used in the Multiavatar WordPress plugin, which is planned for the near future.

For more details, please refer to the PHP repository here: https://github.com/multiavatar/multiavatar-php